Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The oscillatory behavior of single crystalline n-Si(111) in dilute ammonium and sodium fluoride solutions is investigated. Simultaneous in-situ Fourier transform infrared analyses performed in the multiple internal reflection (FTIR-MIR) mode and photocurrent measurements show a pronounced variation in the integrated S…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCP/MAS 13C NMR Spectra of Frozen Solutions of Poly(vinyl alcohol) with Different TacticitiesFumitaka Horii, Kenji Masuda, and Hironori KajiView Author Information Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Ja…
Adducts of the zwitterionic (ZW) form of merocyanine (MC) of five photochromic spirooxazines (SO) and spiropyrans (SP) have, for the first time, been prepared photochemically or thermally through a trapping reaction of metastable MC with trimethylsilyl cyanide (TMSCN) in dichloromethane. The adducts (ZWAs) form easily…
The chemical nature, especially with respect to the surface, of carbon blacks obtained by pyrolysis of used tyres (CBP) is very important for their use as reinforcing filler in rubbers. Both SIMS and Raman spectroscopy were used to investigate the surface and bulk chemistry of CBP obtained by vacuum pyrolysis of used…
The self-assembling of the [Ni(NO2)2(en)2], Mn(II), and NO2- constituents affords the bimetallic chain compound MnNi(NO2)4(en)2. The Mn(II)−Ni(II) intrachain interaction is ferromagnetic, and the compound is a metamagnet with a critical field 1.2 kOe. The magnetic properties were interpreted quantitatively, using a cl…
Dynamic mechanical experiments were conducted on melt-extruded uniaxially oriented high- density polyethylene films having a well-defined stacked lamellar morphology. Samples were cut at different angles with respect to the original machine direction (MD) and tested by increasing the temperature from 20 to 130 °C at a…
The aim of this experimental investigation was to compare the effect of using autologous particulate bone grafts with and without a bioresorbable barrier covering for augmentation of the rabbit skull bone. For this purpose, bilateral, circular, 8 mm wide and 1 mm deep skull bone defects were prepared and overfilled wi…
A series of combined main chain−side group thermotropic polyesters having varying lengths of oxypolymethyleneoxy spacers between the aromatic polyester main chain and the side azobenzene mesogenic unit have been synthesized and their liquid crystalline properties have been investigated. The thermal and liquid crystall…
Heat treatments in several environments were performed on a series of compounds in the Al 2 O 3 and Y 2 O 3 system: Al 2 O 3 Y 3 Al 5 O 12 eutectic, Y 3 Al 5 O 12 , YAlO 3 , Y 4 Al 2 O 9 , and Y 2 O 3 . The yttrium aluminates were found to be stable at high temperatures under vacuum and in air. However, when they were…
A theoretical model is established to predict stress-strain and torque-tensile strain curves of a yarn. The yarn is described by its properties and the arrangement of its fibers, which have a finite length. The yarn is transformed into finite elements. Equilibrium is expressed by virtual work, and is calculated iterat…
The generalized Landau--de Gennes theory for uniaxial and biaxial nematic liquid crystals is analyzed using tensor analysis. In this way all terms allowed by symmetry appear in the free-energy expression. This improves the quantitative shortcomings of the commonly used theory. It appears that uniaxial nematic liquid c…
The evolution of a copper precipitate with a diameter of 3·5 nm containing up to 2·0 at.% of vacancies at different temperatures has been studied by molecular dynamics. The diffusion coefficients were calculated for a single vacancy and vacancy concentrations inside the precipitate of 0·5, 1·0 and 2·0 at.%. The diffus…
The magnetic behavior of some ${\mathrm{R}}_{2}$${\mathrm{Fe}}_{17}$ single crystals have been analyzed quantitatively in a wide temperature range, using a two-sublattice approximation for the magnetic structure and taking into account isotropic exchange and single-ion crystal-field interactions. The 3d sublattice beh…
We prepared thin WN x films with various compositions by reactive sputtering and examined their characterizations and barrier properties applied to Cu/WN x /Si contact systems. The results indicate that the W 65 N 35 barrier, which is in the W 2 N phase with preferred orientation in the (111) plane, shows excellent ba…
Sulfolobus sulfataricus ATCC 35091, Haloferax volcanii, and Methanosarcina thermophila TM-1, representing the Euryarchaeota and Crenarchaeota subdomains of the Archaea, contain proteins which are phosphorylated on tyrosine. These data raise fundamental questions as to the origin and evolution of tyrosine phosphorylati…
Thin films of five different spinels MgAl2O4, MgCr2O4, MgIn2O4, TiMg2O4 and MgFe2O4 were grown by topotaxial solid state reactions on MgO(001) substrates. The spinels widely differed in their lattice parameter resulting in a variation in sign and amount of lattice misfit to the substrate. The films were characterized…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Aromatic Polyisophthalamides by in Situ Silylation of Aromatic Diamines†Angel E. Lozano, Javier de Abajo, and José G. de la CampaView Author Information Instituto de Ciencia y Tecnología de Polímeros, C.S.I.C. Juan de la Cierva 3, 28006 Madrid, SpainCite this: Macr…
The angular properties of various wideband high reflectors are investigated. The theory is developed for the design of high reflectors based on contiguous quarter-wave stacks for use at one oblique angle or for a range of angles of incidence. Numerical results are presented for several high reflectors designed to have…
, Ute Schlue, Maria Koczor, Julie A. Chitty, William C. Taylor, Peter Westhoff, The Promoter of the Gene Encoding the C₄ Form of Phosphoenolpyruvate Carboxylase Directs Mesophyll-Specific Expression in Transgenic C₄ Flaveria spp, The Plant Cell, Vol. 9, No. 4 (Apr., 1997), pp. 479-489
A phase transition from a high-symmetry to a low-symmetry commensurate phase through an incommensurate phase was studied in the framework of the one-dimensional elastically hinged molecule model which includes only a fourth-order anharmonic potential. The phase diagram with respect to the harmonic-potential coefficien…